CN116180583B - Ball screw type eddy current damping stay cable vibration damper - Google Patents
Ball screw type eddy current damping stay cable vibration damper Download PDFInfo
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- CN116180583B CN116180583B CN202310443526.6A CN202310443526A CN116180583B CN 116180583 B CN116180583 B CN 116180583B CN 202310443526 A CN202310443526 A CN 202310443526A CN 116180583 B CN116180583 B CN 116180583B
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- damper
- stay cable
- mounting sleeve
- eddy current
- ball screw
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
- F16F15/035—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means by use of eddy or induced-current damping
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- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
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Abstract
The invention provides a ball screw type eddy current damping stay cable vibration damper which comprises a damper and a damper supporting frame, wherein the damper comprises an eddy current damping component, a ball screw, an inner mounting sleeve and an outer mounting sleeve, and a screw rod of the ball screw is connected with the stay cable and moves along the axial direction when the stay cable vibrates; the outer mounting sleeve is sleeved on the nut of the ball screw with axial limit; the inner mounting sleeve is connected with the damper supporting frame and sleeved in the outer mounting sleeve; the eddy current damping component is arranged between the inner mounting sleeve and the outer mounting sleeve. The invention has the advantages of good vibration reduction effect, high operation reliability and the like.
Description
Technical Field
The invention relates to the field of stay cable vibration reduction, in particular to a ball screw type eddy current damping stay cable vibration reduction device.
Background
Bridge-type bridges commonly used in engineering include suspension bridges, cable-stayed bridges, arch bridges and girder bridges. The cable-stayed bridge is a structural system formed by combining a bearing tower, a tension cable and a bearing beam body, and is a main bridge type bridge with high economy, high stability and large spanning capacity. As the main stress component of the cable-stayed bridge, the stayed cable has the characteristics of large slenderness ratio, large flexibility and small damping coefficient, and is extremely easy to vibrate greatly under the action of wind load, thereby causing corrosion and fatigue damage of the stayed cable anchoring area. In order to solve the problems, the external stay cable vibration reduction damper is one of main measures for controlling the vibration of the stay cable. However, the existing stay cable vibration damper has the following problems:
(1) The durability of the damper is difficult to meet engineering requirements, and the vibration reduction effect is affected.
The damping generation mode of the traditional stay cable damper is as follows: rubber damping, oil pressure damping, magnetorheological damping and friction damping. The parts of the rubber damping type damper and the friction damping type damper which generate damping through direct contact inevitably wear under the condition of long-time reciprocating friction, so that the parameters of the damper are changed, and the vibration reduction effect is gradually deteriorated; the sealing element of the oil pressure damping type damper and the magnetorheological damping type damper is inevitably leaked after long-term use, and the parameters of the damper are also changed.
(2) The damper is easily damaged by bending moment, and the safety and reliability are low.
The damper inevitably moves in the axial direction of the stay cable during operation, and the damper body is subjected to bending moment. The bearing fixing blocks at the two ends of the existing stay cable damper are of a planar structure, the damper body is poor in bending resistance, the damper is easy to damage, and safety accidents are caused.
(3) The damper is difficult to adjust the damping coefficient after the assembly is completed, and the construction period is delayed.
The damping coefficient of the traditional stay cable damper is usually adjusted by adopting modes of adjusting the contact area of a friction plate, adjusting the size of an oil hole and the like, and the damping coefficient is required to be adjusted before the damper is assembled in the adjusting mode, so that the damping coefficient is difficult to adjust after the damper is assembled.
The mechanical properties (such as vibration frequency, self damping ratio and the like) of the stay cable are determined through actual measurement only after the bridge is built, and the mechanical parameters (such as damping coefficient, stroke and the like) of the stay cable vibration damper are related to the mechanical properties of the stay cable. Therefore, if the accuracy of the mechanical parameters of the suspension cable vibration damping damper is to be ensured, the damper needs to be reproduced after the bridge is built and the mechanical parameters of the suspension cable are actually measured, which is contrary to the bridge construction process, so that the bridge construction efficiency is low and the construction period requirement cannot be met.
(4) The connection mode of the damper cannot adapt to inhaul cables with different included angles, and the damper is large in workload, long in construction period and high in cost.
The same cable-stayed bridge is usually provided with dozens or even hundreds of stay cables, the included angles between the stay cables at different installation positions and the bridge deck are different, and at the moment, the included angles between the stay cable damper and the damper supporting frame are also different. The existing stay cable damper cannot adapt to stay cables with different included angles in a connecting mode, namely, for the stay cables with different included angles, the damper supporting frame of the stay cable damper needs to be designed independently, standardized production cannot be achieved, and design workload is large and cost is high.
In addition, the angle between the stay cable and the deck, and the relative distance between the stay cable and the deck may deviate from the theoretical design value after the bridge is formed. In order to avoid delaying the construction period, the stay cable damper arranged between the stay cable and the bridge deck is usually produced according to a theoretical design value, the production according to an actual measurement value cannot be waited until the cable is installed, the deviation between the angle between the stay cable and the bridge deck, the actual value of the relative distance between the stay cable and the bridge deck and the theoretical design value is not negligible after the bridge is formed, at the moment, the stay cable damper arranged in the traditional mode is difficult to install, the installation is required to be carried out after modification, and the construction period is delayed and the cost is high.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the ball screw type eddy current damping stay cable vibration damper with good vibration damping effect and high operation reliability.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the ball screw type eddy current damping stay cable vibration reduction device comprises a damper and a damper supporting frame, wherein the damper comprises an eddy current damping component, a ball screw, an inner mounting sleeve and an outer mounting sleeve, and a screw rod of the ball screw is connected with the stay cable and moves along the axial direction when the stay cable vibrates; the outer mounting sleeve is sleeved on the nut of the ball screw with axial limit; the inner mounting sleeve is connected with the damper supporting frame and sleeved in the outer mounting sleeve; the eddy current damping component is arranged between the inner mounting sleeve and the outer mounting sleeve.
As a further improvement of the above technical scheme:
the damper further comprises two hinged ends, the two hinged ends are respectively arranged at the outer side ends of the screw rod and the inner mounting sleeve, and each hinged end is mounted on the mounting part of the stay cable and/or the damper support frame through a hinged shaft; the two side surfaces of the hinged end head, which are in contact with the mounting part, are arc-shaped rotating surfaces, and the two arc-shaped rotating surfaces are arranged along the axial moving direction of the stay cable.
A radial joint bearing is arranged between the hinge shaft and the hinge end, and the central axis of the radial joint bearing is coincident with the central axis of the hinge shaft; each arc-shaped rotating surface is provided with two arc-shaped sections, the two arc-shaped sections are symmetrically arranged on the periphery of the radial spherical plain bearing, and the central lines of the two arc-shaped rotating surfaces are coincident.
The hinged end head comprises a bearing mounting head, a connecting fixed block and two U-shaped limiting blocks, wherein the radial spherical plain bearing is arranged in the bearing mounting head, and the bearing mounting head is connected with the screw rod; the two U-shaped limiting blocks are symmetrically arranged on the periphery of the radial spherical plain bearing, and the opening ends of the U-shaped limiting blocks are limited on two axial sides of the radial spherical plain bearing; the two U-shaped limiting blocks are fixedly connected through the connecting fixing blocks positioned on the periphery of the bearing mounting head; the arc-shaped section is arranged on the U-shaped limiting block.
The eddy current damping component comprises energy consumption magnetic steel, a conductor plate and a damping coefficient adjusting piece, wherein the energy consumption magnetic steel and the conductor plate are oppositely arranged on the inner installation sleeve and the outer installation sleeve, and the gap between the energy consumption magnetic steel and the conductor plate is adjusted through the damping coefficient adjusting piece arranged on the outer installation sleeve.
A thrust bearing is arranged between the outer mounting sleeve and the inner mounting sleeve, the outer mounting sleeve is provided with a small-diameter section, a radial connecting section and a large-diameter section which are sequentially arranged along the axial direction of the screw rod, and the nut is arranged on the small-diameter section; the radial connecting section is in axial limit fit with the thrust bearing; the eddy current damping component is arranged on the large-diameter section.
The damper further comprises a dust cover, wherein the dust cover comprises a cover body sleeved outside the outer mounting sleeve and a cover arranged at one end, close to the inner mounting sleeve, of the cover body, and an axial moving gap is reserved between the cover and the inner mounting sleeve; one end of the cover body far away from the inner mounting sleeve is fixedly connected with the screw rod.
An angle adjusting assembly is arranged between the damper and the damper supporting frame and comprises a rotating rod and a rod body clamping part, wherein the rotating rod is perpendicular to the plane of the in-plane vibration of the stay cable, and the inner mounting sleeve is connected with the rotating rod; the rod body clamping part comprises two semi-annular clamp locks, one semi-annular clamp lock is arranged on the damper supporting frame, and the two semi-annular clamp locks form a clamping cavity for limiting the rotation of the rotating rod after the rotating rod rotates in place.
The two groups of dampers are symmetrically arranged on two sides of the in-plane vibration plane of the stay cable; one ends of the two groups of dampers are hinged to the same position of the stay cable, and the other ends of the two groups of dampers are respectively hinged to two ends of the rotating rod; the rod body clamping part is arranged in the middle of the rotating rod; or the dampers are a group, and the dampers are positioned in the plane vibration plane of the stay cable; the damper is hinged to the middle part of the rotating rod; the two groups of rod body clamping parts are respectively arranged at the two end parts of the rotating rod.
The damper is vertically connected with the stay cable through a stay cable locking clamp.
Compared with the prior art, the invention has the advantages that:
the damper is provided with an eddy current damping part, a ball screw, an inner mounting sleeve and an outer mounting sleeve, wherein a screw rod of the ball screw is connected with a stay cable; the outer mounting sleeve is sleeved on the nut of the ball screw with the axial limit; the inner mounting sleeve is connected with the damper supporting frame and sleeved in the outer mounting sleeve; the eddy current damping part is arranged between the inner mounting sleeve and the outer mounting sleeve. When the stay cable vibrates, vibration is transmitted to a screw rod connected with the stay cable, the screw rod moves axially, the ball screw converts the axial movement into high-speed rotation movement of the axial limiting nut, at the moment, an outer mounting sleeve mounted on the nut rotates, an outer mounting sleeve rotates relative to an inner mounting sleeve, an electric vortex damping part positioned between the outer mounting sleeve and the inner mounting sleeve generates electric vortex damping force, and energy generated by vibration of the stay cable is finally converted into electric vortex heating heat energy, so that an excellent vibration damping effect is achieved.
Therefore, the invention changes the vibration damping structure and mode of the existing damper in the mode of combining the eddy current vibration damping with the ball screw, and the damper body adopts the mode of eddy current non-friction vibration damping during vibration damping, thereby avoiding the phenomena of contact abrasion vibration damping, liquid leakage and the like of the existing damper, ensuring the vibration damping effect and greatly improving the durability of the damper; meanwhile, the ball screw is applied to eddy current vibration reduction, and the eddy current damping component is arranged between the inner mounting sleeve and the outer mounting sleeve, so that eddy current damping force is generated in a mode of cutting a magnetic induction line in a relative rotation mode, the generation mode of the damping force of the existing damper is changed, the running reliability is high, the vibration reduction effect is ensured, and meanwhile, the structure is simple and compact, and the cost is low.
Further, the two side surfaces, which are contacted with the mounting part, of the hinged end head of the damper are arc-shaped rotating surfaces, and the two arc-shaped rotating surfaces are arranged along the axial moving direction of the stay cable. When the stay cable moves axially, one end of the damper connected with the stay cable can generate a small amount of displacement along the axial direction of the stay cable, and the arc-shaped rotating surface is arranged to enable the damper to be in line contact with the mounting part all the time when the damper generates displacement, so that the bending moment born by the damper in the axial movement along the stay cable in the working process is effectively released, the phenomenon of blocking and bending damage of the damper is avoided, the safety and reliability of the damper in the movement process are improved, and the vibration reduction effect is ensured. Further, a radial joint bearing is arranged between the rotating shaft and the hinged end, and the central axis of the radial joint bearing coincides with the central axis of the hinged shaft, so that the damper has a certain rotating space when the stay cable moves along the axial direction, the phenomenon of locking of the damper is further avoided, and the reliable and safe operation of the damper is better ensured. Meanwhile, the two ends of the existing damper can twist around the axis of the damper when working, and the single centripetal joint shaft cannot restrict the twisting, and the arc-shaped rotating surface of the damper is arranged to enable the damper to be in contact with the mounting part to limit when the damper twists around the axis of the damper, so that the twisting of the damper around the axis direction is limited.
Further, the eddy current damping component comprises energy consumption magnetic steel, a conductor plate and a damping coefficient adjusting piece, wherein the energy consumption magnetic steel and the conductor plate are oppositely arranged on the inner installation sleeve and the outer installation sleeve, and the gap between the energy consumption magnetic steel and the conductor plate is adjusted through the damping coefficient adjusting piece arranged on the outer installation sleeve. The invention can adjust the gap between the energy consumption magnetic steel and the conductor plate through the damping coefficient adjusting piece, realizes real-time continuous adjustment of the damping coefficient of the damper, avoids the problem that the damping coefficient cannot be adjusted after the damper is assembled by adopting modes of adjusting the contact area of the friction plate, the size of the oil passing hole and the like, and has convenient adjustment and high efficiency. Meanwhile, the damping coefficient can be adjusted in real time after the mechanical properties of the bridge are actually measured, so that the problem that the damper is reproduced after the mechanical parameters of the inhaul cable are actually measured is avoided, the bridge construction efficiency is greatly improved, and the requirements of the bridge construction period are met.
Further, an angle adjusting assembly is arranged between the damper and the damper supporting frame, the angle adjusting assembly comprises a rotating rod and a rod body clamping part, the rotating rod is perpendicular to the plane of the in-plane vibration of the stay cable, and the inner mounting sleeve is connected with the rotating rod. The angle of the inner mounting sleeve connected with the rotating rod can be quickly adjusted through the rotating rod when the inclined pull ropes are at different angles, so that the angle of the corresponding damper and the damper supporting frame can be adjusted, the damper can be self-adapted to inclined pull ropes with different included angles, the damper with different sizes is not required to be arranged according to the inclined pull ropes with different angles, the universality of the damper is high, and the cost and the workload are greatly reduced; and the setting of angle adjusting component makes the attenuator can carry out real-time adjustment according to the actual angle and the distance between suspension cable and the bridge floor after the bridge formation, has guaranteed the quick effective installation of attenuator. Simultaneously, the body of rod clamping part includes two semi-ring clamp locks, and semi-ring clamp locks form the clamp chamber after the dwang rotates in place to press from both sides tight dwang, restriction dwang and rotate, and it has guaranteed the safe and reliable operation of follow-up damping operation.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 is a schematic diagram of the ball screw type eddy current damping stay cable vibration attenuation device of the present invention in a specific application.
Fig. 2 is a schematic perspective view of embodiment 1 of the present invention.
Fig. 3 is a front view of fig. 2 of the present invention.
Fig. 4 is a schematic view of another directional structure of fig. 2.
Fig. 5 is a schematic perspective view of a damper according to the present invention.
Fig. 6 is a front cross-sectional view of fig. 5.
Fig. 7 is an enlarged schematic view of a portion a of fig. 6.
Fig. 8 is a schematic perspective view of the hinged head.
Fig. 9 is a schematic perspective view of embodiment 2 of the present invention.
Fig. 10 is a front view of fig. 9 of the present invention.
Fig. 11 is a schematic view of another directional structure of fig. 9.
The reference numerals in the drawings denote:
1. a damper; 11. an eddy current damping member; 111. energy-consumption magnetic steel; 112. a conductor plate; 113. damping coefficient adjusting piece; 12. a ball screw; 121. a screw; 122. a nut; 13. an inner mounting sleeve; 14. an outer mounting sleeve; 141. a small diameter section; 142. a radial connection section; 143. a large diameter section; 15. a hinged end; 151. an arc-shaped rotating surface; 1511. an arc section; 152. a hinge shaft; 153. a bearing mounting head; 154. connecting a fixed block; 155. a U-shaped limiting block; 16. a radial spherical plain bearing; 17. a thrust bearing; 18. a dust cover; 181. a cover body; 182. a cover cap; 2. a damper support; 21. an embedded part; 3. stay cables; 4. a mounting part; 5. an angle adjustment assembly; 51. a rotating lever; 52. a rod body clamping member; 521. a semi-annular clamp lock; 6. stay cable locking clips; 7. a bottom plate.
Detailed Description
The invention will now be described in further detail with reference to the drawings and the specific examples, which are not intended to limit the scope of the invention.
Example 1
Fig. 1 to 6 show an embodiment of a ball screw type eddy current damping stay cable vibration attenuation device of the present invention, which includes a damper 1 and a damper support frame 2, the damper 1 including an eddy current damping member 11, a ball screw 12, an inner mounting sleeve 13 and an outer mounting sleeve 14. Wherein the screw 121 of the ball screw 12 is connected with the stay cable 3, and the screw 121 of the ball screw 12 moves along the axial direction when the stay cable 3 vibrates; the outer mounting sleeve 14 is mounted on the nut 122 of the axially limited ball screw 12, and the outer mounting sleeve 14 rotates with the nut 122 when the nut 122 rotates; one end of the inner mounting sleeve 13 is connected with the damper supporting frame 2, and the other end of the inner mounting sleeve 13 is sleeved in the outer mounting sleeve 14; the eddy current damping member 11 is provided between the inner mounting sleeve 13 and the outer mounting sleeve 14. When the stay cable 3 vibrates, vibration is transmitted to a screw rod 121 connected with the stay cable 3, the screw rod 121 moves axially, the ball screw 12 converts the axial movement into high-speed rotation movement of an axial limiting nut 122, at the moment, an outer mounting sleeve 14 mounted on the nut 122 rotates, the outer mounting sleeve 14 rotates relative to an inner mounting sleeve 13, an electric vortex damping force is generated by an electric vortex damping part 11 positioned between the outer mounting sleeve 14 and the inner mounting sleeve 13, and energy generated by vibration of the stay cable 3 is finally converted into electric vortex heating energy, so that an excellent vibration damping effect is achieved.
Therefore, the invention changes the vibration damping structure and mode of the existing damper 1 in the mode of combining the eddy current vibration damping with the ball screw 12, the damper 1 adopts the mode of eddy current non-friction vibration damping during vibration damping, thereby avoiding the phenomena of contact abrasion, liquid leakage and the like of the existing damper 1, ensuring the vibration damping effect and greatly improving the durability of the damper 1; meanwhile, the ball screw 12 is applied to eddy current vibration reduction, the eddy current damping part 11 is arranged between the inner mounting sleeve 13 and the outer mounting sleeve 14, so that eddy current damping force is generated in a mode of cutting magnetic induction lines in a relative rotation mode, the damping force generation mode of the existing damper 1 is changed, the running reliability is high, the vibration reduction effect is ensured, and meanwhile, the structure is simple and compact, and the cost is low.
Further, as shown in fig. 5 and 6, the damper 1 further includes two hinge ends 15, and the two hinge ends 15 are provided at the outer ends of the screw 121 and the inner mounting sleeve 13, respectively. As shown in fig. 2 and 3, the hinge ends 15 are mounted on the stay cable 3 and/or the mounting portion 4 of the damper supporting frame 2 through the hinge shaft 152, and the mounting portions 4 are located at both ends of the hinge shaft 152; as shown in fig. 4 and 5, two side surfaces of the hinged end head 15, which are in contact with the mounting portion 4, are arc-shaped rotating surfaces 151, the two arc-shaped rotating surfaces 151 are arranged along the axial moving direction of the stay cable 3, and the central lines of the two arc-shaped rotating surfaces 151 are coincident, so that the hinged end head 15 is always in line contact with the mounting portion 4 when the stay cable 1 moves axially, and the phenomena of locking and bending damage of the damper 1 are avoided.
When the stay cable 3 moves axially, one end of the damper 1 connected with the stay cable 3 can displace slightly along the axial direction of the stay cable 3, the arc-shaped rotating surface 151 is arranged to enable the arc-shaped rotating surface 151 to be in line contact with the mounting portion 4 all the time when the damper 1 displaces, bending moment born by the damper 1 in the axial movement along the stay cable 3 in the working process is effectively released, the phenomenon of clamping and bending damage of the damper 1 is avoided, the safety and reliability of the damper 1 in the movement process are improved, and the vibration reduction effect is ensured.
Further, as shown in fig. 5 to 7, a radial joint bearing 16 is disposed between the hinge shaft 152 and the hinge end 15, and the central axis of the radial joint bearing 16 coincides with the central axis of the hinge shaft 152, so that the damper 1 has a certain rotation space when the stay cable 3 moves axially, thereby further avoiding the occurrence of the locking phenomenon of the damper 1 and better ensuring the reliable and safe operation of the damper 1.
Meanwhile, torque around the axis direction of the damper 1 can be generated at two ends of the existing damper 1 during working, the single centripetal joint shaft 16 cannot restrict torsion, and the arc-shaped rotating surface 151 enables the damper 1 to be in contact with the mounting part 4 to limit when torque around the axis direction of the damper 1 is generated, so that torsion of the damper 1 around the axis direction is limited, and therefore, through the combined arrangement of the arc-shaped rotating surface 151 and the centripetal joint bearing 16, the phenomenon of locking and bending damage of the damper 1 can be avoided, torsion of the damper 1 around the axis of the damper 1 can be restrained, and normal working of the damper 1 is ensured.
Further, as shown in fig. 5 and 8, each arc-shaped rotating surface 151 is provided with two arc-shaped sections 1511, and the two arc-shaped sections 1511 are symmetrically arranged on the periphery of the radial spherical plain bearing 16, which ensures that the combined function of the arc-shaped rotating surface 151 and the radial spherical plain bearing 16 is fully exerted, and ensures the reliable and safe operation of the damper 1, and simultaneously, the arc-shaped rotating surfaces 151 and the radial spherical plain bearing 16 are reasonably and compactly distributed in a small space range between the hinged end head 15 and the mounting part 4. Therefore, the invention does not need to enlarge and change the placing space of the position of the hinged end head 15 of the original damper 1, and can avoid the phenomena of the locking of the original damper 1 and the occurrence of bending moment along the axial direction of the damper 1. Preferably, as shown in fig. 7 and 8, the articulating head 15 includes a bearing mounting head 153, a connecting fixed block 154, and two U-shaped stop blocks 155. The radial spherical plain bearing 16 is arranged in the bearing mounting head 153, and the bearing mounting head 153 is connected with the screw 121; the two U-shaped limiting blocks 155 are symmetrically arranged on the periphery of the radial spherical plain bearing 16, and the opening ends of the U-shaped limiting blocks 155 are limited on two axial sides of the radial spherical plain bearing 16 so as to prevent the radial spherical plain bearing 16 from falling out along the axial direction of the hinge shaft 152; the two U-shaped limiting blocks 155 are fixedly connected through the connecting and fixing blocks 154, and the connecting and fixing blocks 154 are positioned on the periphery of the bearing mounting head 153; meanwhile, the arc-shaped section 1511 is provided on the U-shaped stopper 155. The invention ensures the full play of the functions of the arc-shaped rotating surface 151 and the radial spherical plain bearing 16 through the ingenious combination design of the components of the hinged end head 15, and simultaneously ensures that the hinged end head 15 has compact and reasonable layout and small occupied space.
Further, connect fixed block 154 and bearing installation head 153 laminating, two U-shaped stopper 155 pass through fastener detachably and connect in connecting fixed block 154 to the position of two U-shaped stopper 155 is effectively fixed, guarantees the effective performance of U-shaped stopper 155 bearing spacing and anti-sticking dead function. Still further, the bearing mounting head 153 is provided with a limiting groove, and the U-shaped limiting block 155 is in limiting fit with the limiting groove, so as to prevent the movement of the U-shaped limiting block 155.
Further, as shown in fig. 6, the eddy current damping part 11 includes energy-dissipating magnetic steel 111, a conductor plate 112, and a damping coefficient adjusting member 113. The energy-dissipation magnetic steel 111 and the conductor plate 112 are oppositely arranged, the energy-dissipation magnetic steel 111 is installed on the inner installation sleeve 13, and the conductor plate 112 is installed on the outer installation sleeve 14. When the stay cable 3 vibrates and the nut 122 and the outer mounting sleeve 14 rotate at a high speed, the conductor plate 112 positioned on the outer mounting sleeve 14 rotates to cut the magnetic induction line generated by the energy-consumption magnetic steel 111, so that kinetic energy is converted into heat energy, and the heat energy is consumed through natural heat dissipation.
The damping coefficient adjusting piece 113 is arranged at the position of the conductor plate 112 of the outer mounting sleeve 14, and the height of the conductor plate 112 can be adjusted through the damping coefficient adjusting piece 113, so that the gap between the energy-consumption magnetic steel 111 and the conductor plate 112 can be adjusted. The invention realizes real-time continuous adjustment of the damping coefficient of the damper 1, avoids the problem that the damping coefficient cannot be adjusted after the damper 1 is assembled by adopting the modes of adjusting the contact area of the friction plate, the size of the oil passing hole and the like, and has convenient adjustment and high efficiency. Meanwhile, the damping coefficient can be adjusted in real time after the mechanical property of the bridge is actually measured, so that the problem that the damper 1 is reproduced after the mechanical parameter of the inhaul cable is actually measured is avoided, the bridge construction efficiency is greatly improved, and the requirements of the bridge construction period are met.
In other embodiments, the energy consumption magnetic steel 111 and the conductor plate 112 can be mounted in a replaceable manner, that is, the conductor plate 112 is mounted on the inner mounting sleeve 13, and the energy consumption magnetic steel 111 is mounted on the outer mounting sleeve 14. At this time, the damping coefficient adjusting member 113 is disposed on the energy-dissipating magnetic steel 111, and the gap between the energy-dissipating magnetic steel 111 and the conductor plate 112 can be adjusted by adjusting the height of the energy-dissipating magnetic steel 111.
Further, as shown in fig. 6, a thrust bearing 17 is provided between the outer mounting sleeve 14 and the inner mounting sleeve 13, and the outer mounting sleeve 14 is provided with a small diameter section 141, a radial connecting section 142, and a large diameter section 143. The small diameter section 141, the radial connecting section 142 and the large diameter section 143 are sequentially arranged along the axial direction of the screw 121, and the radial connecting section 142 is in axial limit fit with the thrust bearing 17 so as to limit the axial movement of the screw 121 while ensuring the effective rotation of the nut 122, at this time, the outer mounting sleeve 14 mounted on the nut 122 rotates relative to the inner mounting sleeve 13, so that the eddy current damping component 11 positioned between the outer mounting sleeve 14 and the inner mounting sleeve 13 generates eddy current damping force, and the damping vibration reduction effect is ensured. Meanwhile, the eddy current damping part 11 is arranged on the large-diameter section 143, and the nut 122 is arranged on the small-diameter section 141, so that the structure is simple and the layout is compact.
Further, the damper 1 further includes a dust cover 18, and the dust cover 18 includes a cover body 181 and a cover 182. The cover body 181 is sleeved outside the outer mounting sleeve 14, and the cover body 181 is fixedly connected with the screw 121; the cover 182 is disposed at one end of the cover body 181 near the inner mounting sleeve 13, and an axial movement gap is left between the cover 182 and the inner mounting sleeve 13, so that the dust cover 18 connected with the screw 121 can move axially relative to the inner mounting sleeve 13, thereby ensuring reliable operation of the damper 1.
Further, the cover 181 is a steel cover, and the cover 182 is a rubber cover, so as to facilitate the disassembly of the dust cover 18. After the installation is completed, the damping coefficient of the damper 1 can be quickly and effectively adjusted by detaching the dust cover 18 and adjusting the damping coefficient adjusting member 113.
As shown in fig. 2 to 4, an angle adjusting assembly 5 is provided between the damper 1 and the damper supporting frame 2, and the angle adjusting assembly 5 includes a rotating lever 51 and a lever body clamping member 52. The rotating rod 51 is arranged perpendicular to the plane of the in-plane vibration of the stay cable 3, the plane of the in-plane vibration of the stay cable 3 is the plane of the up-and-down vibration of the stay cable 3 shown in fig. 1, and the inner mounting sleeve 13 is connected with the rotating rod 51. Namely, the rotation plane of the rotating rod 51 is parallel to the angle adjusting plane of the stay cable 3, at this time, when the stay cable 3 is at different angles, the angle of the inner mounting sleeve 13 connected with the rotating rod 51 can be quickly adjusted through the rotating rod 51, so that the angle adjustment of the corresponding damper 1 and the damper supporting frame 2 is realized, the damper 1 can be self-adapted to the stay cables 3 with different included angles, and the damper 1 with different sizes is not required to be arranged according to the stay cables 3 with different angles, so that the universality of the damper 1 is strong, and the cost and the workload are greatly reduced; and the setting of angle adjusting part 5 makes the attenuator 1 can carry out real-time adjustment according to actual angle and real-time distance between stay cable 3 and the bridge floor after the bridge formation, has guaranteed the quick effective installation of attenuator 1.
Meanwhile, the rod clamping member 52 includes two semi-annular clamp locks 521. The half ring clamp locks 521 are arranged on the damper supporting frame 2, and after the rotating rod 51 rotates in place, two half ring clamp locks 521 form a clamping cavity which is arranged along the axial direction of the rotating rod 51 so as to clamp the rotating rod 51 which rotates in place, thereby ensuring the safe and reliable operation of the subsequent vibration reduction operation.
Preferably, the semi-ring clamp lock 521 is mounted on top of the damper support frame 2 by a removable bottom plate 7 to facilitate the removal and installation of the damper 1 and the angle adjustment assembly 5.
In this embodiment, as shown in fig. 2 to 4, the two sets of dampers 1 are symmetrically arranged at two sides of the in-plane vibration plane of the stay cable 3, one ends of the two sets of dampers 1 are hinged at the same position of the stay cable 3, and the other ends of the two sets of dampers 1 are respectively hinged at two ends of the rotating rod 51; the rod body clamping member 52 is provided in the middle of the rotation rod 51. The device realizes the control of the vibration in and out of the stay cable 3, has adjustable angle of the damper 1, has simple and compact layout and small occupied space,
as shown in fig. 1 and 2, the damper 1 is vertically connected to the stay cable 3 by a stay cable locking clip 6. The damper 1 vibrates along the vertical direction of the stay cable 3, and the damper 1 is perpendicular to the stay cable 3, so that the best vibration control effect of the stay cable 3 is ensured.
In this embodiment, the damper supporting frame 2 is mounted on the steel box girder through the embedded part 21. The embedded part 21 needs to be installed in place when the box girder is poured, because when bridge deck adjustment is completed, the damper 1 reaches the standard requirement (including stress relief), if the bridge deck is welded in a large area, internal stress is generated, and therefore the embedded part 21 and the steel box girder need to be processed together, the vibration reduction effect is guaranteed, and the installation of the steel box girder is facilitated.
Example 2
Fig. 9 to 11 show another embodiment of a ball screw type eddy current damping suspension cable vibration attenuation device according to the present invention, which is basically the same as the previous embodiment, except that the dampers 1 of the present embodiment are in a group, and the dampers 1 are located in the plane of the in-plane vibration of the suspension cable 3, so as to realize the control of the in-plane vibration of the suspension cable 3. Meanwhile, the damper 1 is hinged to the middle of the rotating rod 51; the rod body clamping members 52 are two groups, and the two groups of rod body clamping members 52 are respectively arranged at two end parts of the rotating rod 51. The layout is compact and the occupied space is small.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (9)
1. The ball screw type eddy current damping stay cable vibration damper comprises a damper and a damper supporting frame, and is characterized in that the damper comprises an eddy current damping component, a ball screw, an inner mounting sleeve and an outer mounting sleeve, wherein a screw rod of the ball screw is connected with the stay cable and moves along the axial direction when the stay cable vibrates; the outer mounting sleeve is sleeved on the nut of the ball screw with axial limit; the inner mounting sleeve is connected with the damper supporting frame and sleeved in the outer mounting sleeve; the eddy current damping component is arranged between the inner mounting sleeve and the outer mounting sleeve; the damper further comprises two hinged ends, the two hinged ends are respectively arranged at the outer side ends of the screw rod and the inner mounting sleeve, and each hinged end is mounted on the mounting part of the stay cable and/or the damper support frame through a hinged shaft; the two side surfaces of the hinged end head, which are in contact with the mounting part, are arc-shaped rotating surfaces, the two arc-shaped rotating surfaces are arranged along the axial moving direction of the stay cable, and the central lines of the two arc-shaped rotating surfaces are coincided.
2. The ball screw type eddy current damping stay cable vibration reduction device according to claim 1, wherein a radial joint bearing is arranged between the hinge shaft and the hinge end, and the central axis of the radial joint bearing coincides with the central axis of the hinge shaft; each arc-shaped rotating surface is provided with two arc-shaped sections, and the two arc-shaped sections are symmetrically arranged on the periphery of the radial spherical plain bearing.
3. The ball screw type eddy current damping stay cable vibration attenuation device according to claim 2, wherein the hinged end head comprises a bearing mounting head, a connecting fixed block and two U-shaped limiting blocks, wherein the centripetal joint bearing is arranged in the bearing mounting head, and the bearing mounting head is connected with the screw; the two U-shaped limiting blocks are symmetrically arranged on the periphery of the radial spherical plain bearing, and the opening ends of the U-shaped limiting blocks are limited on two axial sides of the radial spherical plain bearing; the two U-shaped limiting blocks are fixedly connected through the connecting fixing blocks positioned on the periphery of the bearing mounting head; the arc-shaped section is arranged on the U-shaped limiting block.
4. The ball screw type eddy current damping stay cable vibration reduction device according to claim 1, wherein the eddy current damping component comprises energy consumption magnetic steel, a conductor plate and a damping coefficient adjusting piece, the energy consumption magnetic steel and the conductor plate are oppositely arranged on the inner mounting sleeve and the outer mounting sleeve, and a gap between the energy consumption magnetic steel and the conductor plate is adjusted through the damping coefficient adjusting piece arranged on the outer mounting sleeve.
5. The ball screw type eddy current damping stay cable vibration attenuation device according to claim 1, wherein a thrust bearing is arranged between the outer mounting sleeve and the inner mounting sleeve, the outer mounting sleeve is provided with a small diameter section, a radial connecting section and a large diameter section which are sequentially arranged along the axial direction of a screw rod, and the nut is arranged on the small diameter section; the radial connecting section is in axial limit fit with the thrust bearing; the eddy current damping component is arranged on the large-diameter section.
6. The ball screw type eddy current damping stay cable vibration reduction device according to claim 1, wherein the damper further comprises a dust cover, the dust cover comprises a cover body sleeved outside the outer mounting sleeve, and a cover arranged at one end of the cover body close to the inner mounting sleeve, and an axial movement gap is reserved between the cover and the inner mounting sleeve; one end of the cover body far away from the inner mounting sleeve is fixedly connected with the screw rod.
7. The ball screw type eddy current damping stay cable vibration reduction device according to any one of claims 1 to 6, wherein an angle adjustment assembly is provided between the damper and the damper support frame, the angle adjustment assembly including a rotating rod and a rod body clamping member, wherein the rotating rod is arranged perpendicular to an in-plane vibration plane of the stay cable, and the inner mounting sleeve is connected with the rotating rod; the rod body clamping part comprises two semi-annular clamp locks, one semi-annular clamp lock is arranged on the damper supporting frame, and the two semi-annular clamp locks form a clamping cavity for limiting the rotation of the rotating rod after the rotating rod rotates in place.
8. The ball screw type eddy current damping stay cable vibration reduction device according to claim 7, wherein the dampers are arranged in two groups, and the two groups of dampers are symmetrically arranged on two sides of an in-plane vibration plane of the stay cable; one ends of the two groups of dampers are hinged to the same position of the stay cable, and the other ends of the two groups of dampers are respectively hinged to two ends of the rotating rod; the rod body clamping part is arranged in the middle of the rotating rod;
or the dampers are a group, and the dampers are positioned in the plane vibration plane of the stay cable; the damper is hinged to the middle part of the rotating rod; the two groups of rod body clamping parts are respectively arranged at the two end parts of the rotating rod.
9. The ball screw type eddy current damping stay cable vibration attenuation device according to any one of claims 1 to 6, wherein the damper is vertically connected to the stay cable by a stay cable locking clip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310443526.6A CN116180583B (en) | 2023-04-24 | 2023-04-24 | Ball screw type eddy current damping stay cable vibration damper |
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| CN202310443526.6A CN116180583B (en) | 2023-04-24 | 2023-04-24 | Ball screw type eddy current damping stay cable vibration damper |
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| JP2005146837A (en) * | 2003-11-12 | 2005-06-09 | Freyssinet Internatl Stup | Device attenuating vibration of a plurality of stay sheets of building and damping method corresponding thereto |
| JP2017214721A (en) * | 2016-05-30 | 2017-12-07 | 株式会社Ｎｔｔファシリティーズ | Axial length variable device, vibration control device, and vibration control system |
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| JPH0860619A (en) * | 1994-08-19 | 1996-03-05 | Ishikawajima Harima Heavy Ind Co Ltd | Vibration-control damper for cable of diagonally stretched bridge |
| FR2854217B1 (en) * | 2003-04-22 | 2006-07-21 | Jarret Soc | VIBRATION AND DISPLACEMENT DAMPER, ESPECIALLY FOR WINDING CABLES |
| CN102561184B (en) * | 2011-12-30 | 2014-10-29 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Vertical shock absorption device with external stayed cable |
| CN103469728B (en) * | 2013-09-25 | 2016-08-24 | 无锡市弘谷振控技术有限公司 | External stayed cable damping device |
| CN104265818B (en) * | 2014-09-15 | 2015-07-08 | 陈政清 | Outer cup rotary axial eddy current damper |
| CN105134856B (en) * | 2015-09-21 | 2017-09-22 | 无锡市弘谷振控技术有限公司 | External stayed cable closed cylinder type sticky shearing type damper |
| JP6696754B2 (en) * | 2015-11-05 | 2020-05-20 | 株式会社ビー・ビー・エム | Composite vibration damper for structures |
| CN107022955B (en) * | 2017-02-27 | 2019-02-01 | 华北水利水电大学 | Apparent mass rotary electric magnetic damper vibration absorbing device for staying cables of bridge and design method |
| CN107401112A (en) * | 2017-09-07 | 2017-11-28 | 湖南科技大学 | A kind of electromagnetic rotating inertia mass damper |
| CN109611486B (en) * | 2018-11-19 | 2019-09-13 | 湖南省潇振工程科技有限公司 | A kind of current vortex axial direction damper |
| CN210194417U (en) * | 2019-04-03 | 2020-03-27 | 柳州东方工程橡胶制品有限公司 | External vibration damper of suspension cable |
| CN112443613A (en) * | 2020-12-14 | 2021-03-05 | 株洲联诚集团减振器有限责任公司 | Rotary eddy current vibration absorber with adjustable damping |
| CN112942104B (en) * | 2021-04-21 | 2023-03-03 | 华北水利水电大学 | Stay cable vibration reduction device of magneto negative stiffness damper and design method |
| CN114703743B (en) * | 2022-04-29 | 2023-02-21 | 湖南大学 | Electric eddy-friction combined damper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005146837A (en) * | 2003-11-12 | 2005-06-09 | Freyssinet Internatl Stup | Device attenuating vibration of a plurality of stay sheets of building and damping method corresponding thereto |
| JP2017214721A (en) * | 2016-05-30 | 2017-12-07 | 株式会社Ｎｔｔファシリティーズ | Axial length variable device, vibration control device, and vibration control system |
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